ORP Sensor - The Right Metal for Your ORP Application

ORP Sensor

The Oxidation-Reduction Potential (ORP) Sensors

High Potential - The Right Metal for Your Application

METTLER TOLEDO offers platinum, silver and gold ORP sensors to best support your application. While platinum sensors cover a majority of applications, a gold sensor is best in the case of highly oxidizing samples. Finally, silver sensors should be used for silver-based electrochemistry such as chloride determination.

 
 

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To fit your electrochemistry system needs, we offer a variety of benchtop and portable meters that are professional and durable. Our portfolio offers products designed for compliance, routine measurements or anyone working on a tight budget.

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Solutions

pH Solutions

METTLER TOLEDO offers a comprehensive range of top quality buffers, standards, electrolytes, cleaning and verification solutions for determination of pH, conductivity, ion concentration, ORP and dissolved oxygen. All solutions are available in small volume bottles either in packs or single and single use sachets.

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Service for pH meters and sensors

We offer different service packages depending on your needs. These range from professional on-site installation and configuration to documented proof of compliancy. If full coverage beyond initial warranty is desired, we offer an extended care package in the form of preventive maintenance and repair.

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Analytical Instruments

Products and Specs

 
Products and Specs
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Metal
Type of junction
Shaft Material
Sensor Type
Shaft Diameter
Material No.: 51343200
See details
MetalPlatinum ring
Type of junctionCeramic
Shaft MaterialGlass
Sensor TypeCombined electrode
Shaft Diameter12 mm
SampleGeneral Purpose
Material No.: 51343202
See details
MetalPlatinum ring
Type of junctionCeramic
Shaft MaterialGlass
Sensor TypeCombined electrode
Shaft Diameter12 mm
SampleLarge samples
Material No.: 51343204
See details
MetalGold Ring
Type of junctionCeramic
Shaft MaterialGlass
Sensor TypeCombined electrode
Shaft Diameter12 mm
SampleHighly oxidizing samples
Material No.: 51343205
See details
MetalSilver ring
Type of junctionCeramic
Shaft MaterialGlass
Sensor TypeCombined electrode
Shaft Diameter12 mm
SampleGeneral Purpose
Material No.: 51343201
See details
MetalPlatinum ring
Type of junctionMovable glass sleeve
Shaft MaterialGlass
Sensor TypeCombined electrode
Shaft Diameter12 mm
SampleEmulsion; General Purpose; waste water
Material No.: 51343203
See details
MetalPlatinum ring
Type of junctionCeramic
Shaft MaterialGlass
Sensor TypeCombined electrode
Shaft Diameter6 mm
SampleSmall samples
Material No.: 59904377
See details
MetalPlatinum ring
Type of junction--
Shaft MaterialGlass
Sensor TypeHalf-cell
Shaft Diameter12 mm
SampleGeneral Purpose
Material No.: 59904391
See details
MetalSilver ring
Type of junction--
Shaft MaterialGlass
Sensor TypeHalf-cell
Shaft Diameter12 mm
SampleGeneral Purpose
Material No.: 59904408
See details
MetalSilver tip
Type of junction--
Shaft MaterialPP
Sensor TypeHalf-cell
Shaft Diameter12 mm
SampleGeneral Purpose
Comparison

Documentation

Product Brochures

InLab® Sensors
The manufacturing of high quality sensors with outstanding performance not only requires technical skills and expertise but also a profound understand...

Services

Explore our Services - Tailored to Fit your Equipment

We support and service your measurement equipment through its entire life-cycle, from installation to preventive maintenance and calibration to equipment repair.

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Expertise
Training & Consulting

FAQ

How to store ORP sensors correctly?

All user manuals come with the necessary information about the short and long term storage of the respective probe.

General tips for long term storage:

ORP electrodes should be stored in the wetting cap filled with reference electrolyte (often 3 mol/L KCl).

How to clean an ORP Sensor?

Several factors can lead to the blockage of ORP sensor diaphragms. In particular, junctions made of ceramic, or other porous material are prone to clogging. The most frequent reasons are listed here together with the respective cleaning procedures:

Blockage with silver sulfide (Ag2S): if the reference electrolyte contains silver ions and the sample being measured contains sulfides, the junction will get contaminated with a silver sulfide precipitate. To clear the junction of this contamination, clean it with 8% thiourea in 0.1 mol/L HCl solution (Thiourea Cleaner is available from METTLER TOLEDO).

Blockage with silver chloride (AgCl): the silver ions from the reference electrolyte can also react with samples that contain chloride ions, resulting in an AgCl precipitate. This precipitate can be removed by soaking the electrode in a concentrated ammonia solution (35% NH3 aq.).

Blockage with proteins: junctions contaminated with proteins can often be cleaned by immersing the electrode in a pepsin/HCl (5 % pepsin in 0.1 mol/L HCl) solution for several hours (Pepsin-HCl Cleaner is available from METTLER TOLEDO).

Other junction blockages

If the junction is blocked with other contaminations, try cleaning the ORP sensor in an ultrasonic bath with water or with a 0.1 mol/L HCl solution.

Which ORP sensor should be used?

Redox electrodes with a platinum ring are the "standard" ORP sensors. This is why we have it with different geometries and junctions (e.g. InLab® Redox Micro, InLab® Redox Pro). Redox electrodes are only used if anything in the sample undergoes a chemical reaction with platinum -- the idea behind the noble metal ring is to not be involved in any chemical reaction. One example where a platinum redox electrode is not recommended is concentrated hydrochloric acid because Pt-Clcomplexes can be produced.

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